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Federal Pacific 4320 NFS - 20A 3 Pole Molded Case Circuit Breaker
- 20A
- 3 Pole
- Plug-On
Federal Pacific
4320
NFS - 20A 3 Pole Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
4320
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Federal Pacific NFS4320 - 20A 3 Pole Molded Case Circuit Breaker
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Description
Delivering 20A of thermal-magnetic protection, the Federal Pacific 4320 is a 3-pole molded case circuit breaker. It is engineered to safeguard commercial 3-phase systems against overloads. This plug-on breaker utilizes a stab-in mounting style for seamless integration into Federal Pacific NFS panelboards. It provides an exact fit for legacy enclosures, ensuring safe system maintenance. The N-Frame device features an 18kAIC rating at 600VAC and includes factory-installed load-side lugs.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | 4320-R |
| Series | NFS |
| Amperage | 20A |
| Poles | 3 |
| Mounting Style | Plug-On |
| Voltage | 600VAC |
| Phase | 3 |
| AIC Rating | 18kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Federal Pacific NFS Panelboards |
| Wire Gauge | 14-10 AWG |
| Max Wire | 10 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | UL 489, NEMA AB-1 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
6 answersWhich panelboards accept the Federal Pacific NFS4320 circuit breaker?
This N-Frame breaker is engineered exclusively for legacy Federal Pacific NFS panelboards. It utilizes a stab-in mounting mechanism to connect directly to the original FPE busbar infrastructure.
Does the NFS4320 require bolting to the panel bus?
No, this breaker features a plug-on design. It uses a stab-in mounting mechanism rather than bolt-on connections to secure it to the panelboard bus.
What wire gauge range is supported by the terminal lugs on the NFS4320?
The load side lugs on this 20-amp breaker are sized to accommodate conductors ranging from 14 AWG to 10 AWG. Ensure proper torque specifications are followed during installation.
How does the thermal-magnetic trip unit operate on the NFS4320?
The breaker uses a fixed thermal element for long-time overload protection and a fixed magnetic element for instantaneous short-circuit protection. The trip unit is factory sealed and non-interchangeable.
What is the maximum fault current interrupting capacity for the NFS4320?
This breaker is rated to safely interrupt up to 18kA of fault current at its maximum operating voltage of 600VAC.
Are FPE 4320 and NFS4320 the same circuit breaker?
Yes, NFS4320 is the complete catalog number for the NF-S frame breaker commonly identified in the field as the FPE 4320. Both refer to the same 3-pole, 600VAC legacy Federal Pacific component.
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